US8258501B2 - Use of a metal complex as an n-Dopant for an organic semiconducting matrix material, organic of semiconducting material and electronic component, and also a dopant and ligand and process for producing same - Google Patents
Use of a metal complex as an n-Dopant for an organic semiconducting matrix material, organic of semiconducting material and electronic component, and also a dopant and ligand and process for producing same Download PDFInfo
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- US8258501B2 US8258501B2 US10/585,215 US58521505A US8258501B2 US 8258501 B2 US8258501 B2 US 8258501B2 US 58521505 A US58521505 A US 58521505A US 8258501 B2 US8258501 B2 US 8258501B2
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- dopant
- ring system
- alkyl
- aryl
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- 239000003446 ligand Substances 0.000 title claims abstract description 222
- 239000002019 doping agent Substances 0.000 title claims abstract description 115
- 239000011159 matrix material Substances 0.000 title claims abstract description 68
- 150000004696 coordination complex Chemical class 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 title claims description 42
- 239000004065 semiconductor Substances 0.000 title abstract description 27
- 125000004429 atom Chemical group 0.000 claims abstract description 266
- 229910052751 metal Inorganic materials 0.000 claims abstract description 122
- 239000002184 metal Substances 0.000 claims abstract description 122
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 51
- 150000003624 transition metals Chemical group 0.000 claims abstract description 45
- 230000007935 neutral effect Effects 0.000 claims abstract description 24
- 125000003118 aryl group Chemical group 0.000 claims description 155
- 229910052717 sulfur Inorganic materials 0.000 claims description 116
- 229910052760 oxygen Inorganic materials 0.000 claims description 100
- 229910052698 phosphorus Inorganic materials 0.000 claims description 87
- 229910052757 nitrogen Inorganic materials 0.000 claims description 80
- 229910052710 silicon Inorganic materials 0.000 claims description 66
- 125000001072 heteroaryl group Chemical group 0.000 claims description 64
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims description 63
- 229910052732 germanium Inorganic materials 0.000 claims description 61
- 229910052711 selenium Inorganic materials 0.000 claims description 58
- 229910052718 tin Inorganic materials 0.000 claims description 57
- 125000004122 cyclic group Chemical group 0.000 claims description 56
- 229920006395 saturated elastomer Polymers 0.000 claims description 47
- -1 C1-C20 cycloalkyl Chemical group 0.000 claims description 39
- 229910052723 transition metal Inorganic materials 0.000 claims description 30
- 125000000217 alkyl group Chemical group 0.000 claims description 29
- 229910052750 molybdenum Inorganic materials 0.000 claims description 28
- 229910052785 arsenic Inorganic materials 0.000 claims description 26
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims description 22
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 21
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- 229910052721 tungsten Inorganic materials 0.000 claims description 19
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 18
- 229910052796 boron Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
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- 239000000758 substrate Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 238000000859 sublimation Methods 0.000 claims description 4
- 230000008022 sublimation Effects 0.000 claims description 4
- 239000010953 base metal Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
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- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 2
- 229910052792 caesium Inorganic materials 0.000 claims description 2
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- 150000004292 cyclic ethers Chemical class 0.000 claims description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 claims description 2
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- 125000006193 alkinyl group Chemical group 0.000 claims 3
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- 125000003342 alkenyl group Chemical group 0.000 claims 1
- 239000003849 aromatic solvent Substances 0.000 claims 1
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 239000012458 free base Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 239000011368 organic material Substances 0.000 claims 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 claims 1
- 125000004309 pyranyl group Chemical group O1C(C=CC=C1)* 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 8
- 150000001875 compounds Chemical class 0.000 description 71
- 239000010410 layer Substances 0.000 description 65
- 125000005842 heteroatom Chemical group 0.000 description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 34
- 0 *C1=C(*)/C(*)=C(*)\C(*)=C(*)/C(*)=C\1*.*C1=C(*)C(*)=C(*)C(*)=C1*.*C1=C(*)C(*)=C(*)C(*)C(*)=C1*.*C1=C(*)C(*)=C(*)[C+](*)C(*)=C1*.*C1=C(*)C(*)=C2C(=C1*)C(*)=C(*)C2*.*C1=C(*)C2=C(C(*)C(*)=C1*)C(*)C(*)C2*.*C1=C(*)C2=C([C+](*)C(*)=C1*)C(*)C(*)C2*.*C1=C(*)[C-](*)C(*)=C1* Chemical compound *C1=C(*)/C(*)=C(*)\C(*)=C(*)/C(*)=C\1*.*C1=C(*)C(*)=C(*)C(*)=C1*.*C1=C(*)C(*)=C(*)C(*)C(*)=C1*.*C1=C(*)C(*)=C(*)[C+](*)C(*)=C1*.*C1=C(*)C(*)=C2C(=C1*)C(*)=C(*)C2*.*C1=C(*)C2=C(C(*)C(*)=C1*)C(*)C(*)C2*.*C1=C(*)C2=C([C+](*)C(*)=C1*)C(*)C(*)C2*.*C1=C(*)[C-](*)C(*)=C1* 0.000 description 32
- 125000001424 substituent group Chemical group 0.000 description 31
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 29
- 210000000080 chela (arthropods) Anatomy 0.000 description 27
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- 239000010949 copper Substances 0.000 description 21
- 229910052748 manganese Inorganic materials 0.000 description 21
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 20
- 229910052802 copper Inorganic materials 0.000 description 20
- 229910052714 tellurium Inorganic materials 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 19
- HZVOZRGWRWCICA-UHFFFAOYSA-N methanediyl Chemical compound [CH2] HZVOZRGWRWCICA-UHFFFAOYSA-N 0.000 description 19
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical class C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 18
- 238000003786 synthesis reaction Methods 0.000 description 18
- 125000004433 nitrogen atom Chemical group N* 0.000 description 16
- 238000005160 1H NMR spectroscopy Methods 0.000 description 14
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
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- 239000000243 solution Substances 0.000 description 11
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- 229910052745 lead Inorganic materials 0.000 description 10
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 10
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- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 description 9
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- WREOTYWODABZMH-DTZQCDIJSA-N [[(2r,3s,4r,5r)-3,4-dihydroxy-5-[2-oxo-4-(2-phenylethoxyamino)pyrimidin-1-yl]oxolan-2-yl]methoxy-hydroxyphosphoryl] phosphono hydrogen phosphate Chemical compound O[C@@H]1[C@H](O)[C@@H](COP(O)(=O)OP(O)(=O)OP(O)(O)=O)O[C@H]1N(C=C\1)C(=O)NC/1=N\OCCC1=CC=CC=C1 WREOTYWODABZMH-DTZQCDIJSA-N 0.000 description 6
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- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- MJGFBOZCAJSGQW-UHFFFAOYSA-N mercury sodium Chemical compound [Na].[Hg] MJGFBOZCAJSGQW-UHFFFAOYSA-N 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 125000002971 oxazolyl group Chemical group 0.000 description 1
- WYURNTSHIVDZCO-SVYQBANQSA-N oxolane-d8 Chemical compound [2H]C1([2H])OC([2H])([2H])C([2H])([2H])C1([2H])[2H] WYURNTSHIVDZCO-SVYQBANQSA-N 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- 150000005041 phenanthrolines Chemical class 0.000 description 1
- 229910000065 phosphene Inorganic materials 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- ZHPZIYGKAJRWIE-UHFFFAOYSA-N pteridine Chemical compound N1=CN=CC2=NC=CN=C21.N1=CN=CC2=NC=CN=C21 ZHPZIYGKAJRWIE-UHFFFAOYSA-N 0.000 description 1
- 150000003216 pyrazines Chemical class 0.000 description 1
- ASRAWSBMDXVNLX-UHFFFAOYSA-N pyrazolynate Chemical compound C=1C=C(Cl)C=C(Cl)C=1C(=O)C=1C(C)=NN(C)C=1OS(=O)(=O)C1=CC=C(C)C=C1 ASRAWSBMDXVNLX-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- MABNMNVCOAICNO-UHFFFAOYSA-N selenophene Chemical compound C=1C=C[se]C=1 MABNMNVCOAICNO-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001023 sodium amalgam Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- ZWZVWGITAAIFPS-UHFFFAOYSA-N thiophosgene Chemical compound ClC(Cl)=S ZWZVWGITAAIFPS-UHFFFAOYSA-N 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
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Definitions
- the invention relates to the use of a metal complex as a dopant for doping an organic semiconducting matrix material in order to alter the electrical characteristics of the matrix material.
- the invention further relates to an organic semiconducting material containing an organic matrix material and a metal complex as an n-dopant and having an electronic component.
- the invention further relates to n-dopants and ligands, as well as to novel processes for their production.
- the invention relates to the use of a metal complex as a dopant for doping an organic semiconducting matrix material in order to alter the latter's electrical characteristics, the compound constituting an n-dopant with regard to the matrix material; it also relates to an organic semiconducting material containing an organic matrix material and a metal complex as an n-dopant, and also to an electronic device with an organic semiconducting material which is doped with a metal complex as an n-dopant.
- the invention further relates to n-dopants and ligands and processes for producing them.
- organic compounds used as dopants often do not have a sufficiently low oxidation potential for the application in question.
- the present invention is therefore aimed at solving the problem of providing metal complexes as n-dopants for doping an organic semi-conducting matrix material, especially for manufacturing electronic devices, which in particular also have sufficiently low oxidation potentials to produce electron transport materials for organic light-emitting diodes (OLED), without having any disturbing influences on the matrix material, and which cause an effective increase in the number of charge carriers in the matrix material and are preferably comparatively easy to handle.
- an electron-rich metal complex is used in a neutral form as an n-dopant vis-à-vis the organic semiconducting matrix material, there is a considerably stronger donor available than in organic donor compounds known hitherto.
- the provision of a neutral electron-rich metal complex makes it possible to vary the donor characteristics of the compound by selecting a suitable central atom, and thus to vary its oxidation potential.
- the n-dopants of the invention thus preferably have a very low oxidation potential.
- the complex preferably has at least one organic ligand, without being restricted to that.
- the use of the n-dopants of the invention can substantially increase the conductivity of charge transport layers, and/or the passage of the charge carriers between the contacts and the organic layer can be improved considerably in applications as electronic devices.
- the metal complexes used in accordance with the invention are preferably isolated molecules, which are thus preferably present in the semiconducting layer concerned as isolated molecules that are not immobilized by chemical bonds among each other and/or by being bound to a matrix and/or to another component.
- the valence electrons of the metal central atoms are thus preferably provided substantially or completely by the ligands of the complex and the metal atoms of the complex, these being arranged within the coordination sphere formed by the ligands, which is preferably at least substantially closed.
- all the metal atoms of the complex or all the metal atoms of an outer sphere of the metal complex are coordinated to non-metallic ligands, preferably organic ligands.
- non-metallic ligands preferably organic ligands.
- individual metal complexes may in each case be bound to one another or to other components, such as the matrix material, in order optionally to immobilize the metal complexes.
- the ligands may, for example, possess suitable functional groups that can be linked together, such as unsaturated groups, which may react with one another in a linear or branched manner to form an oligomer or polymer.
- the complexed central atom may have a formal number of valence electrons VE of 16 or more, such as 18 or 19 or 20 or 21 or more valence electrons.
- the central atom may in this case in particular be a metal atom from the first transition metal period, a metal atom from the second transition metal period or a metal atom from the third transition metal period.
- the complexes of the invention may be at least binuclear complexes with at least one metal-metal bond between the central atoms, as a result of which particularly electron-rich metal complexes with a high electron density at the central atom of the metal complex can be provided in each case.
- the central atom may, for example, be a metal atom from the group of the first transition metal period (scandium to zinc), or a metal from the second transition metal period (yttrium to cadmium), e.g. rhodium, palladium, silver and cadmium, or a metal from the third transition metal period, including lanthanides and actinides.
- the central atom may in particular be a metal from the 7th to 10th groups.
- the transition metal of the at least one central atom may also be one of the following elements in each case: V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Nd, Ta, Mo, W, Rh, Ir, Pd, Pt.
- the transition metal atom is particularly preferably selected from the group Mn, Fe, Co, Ni, Cu, Zn, e.g. selected from the group Fe, Co, Ni.
- the transition metal atom may be selected from the group Cr, Mo, W.
- the transition metal atom may also be selected from the group V, Nb, Ta or the group Ir, Pt, Au, Hg.
- metal complexes with a smaller formal number of valence electrons at the metal central atom of the complex, or with a lower electron density at the metal central atom may also be used.
- the transition metal atom may be present as a neutral atom or as a charged transition metal atom, preferably with a formal charge of 0 to 3, e.g. a formal charge of 0, 1 or 2, it being in particular possible for the central atom to be an atom from the first transition metal period.
- the charge of the central atom which may be an atom from the first, second or third transition metal periods, may also be different from 0.
- At least one, two or more, or all of the ligand atoms (donor atom) binding to the central atom may be different from an aromatic nitrogen atom which is part of an aromatic 6-membered ring, in which the nitrogen atom has a double bond with a neighboring atom, especially a carbon atom.
- pyridine, pyrimidine, pyridazine or pyrazine are often used as such ligands.
- At least one, two or more, or all of the ligand atoms binding to the central atom may optionally also be different from an aromatic nitrogen atom of a 5-membered ring, such as a pyrrole or imidazole ring, for example.
- the aromatic ring of the substituent may not have a coordinating nitrogen atom or a substituent with an N atom.
- at least one ligand atom binding to at least one central atom may be present which is different from the nitrogen atom of a pyridine, 2,2′; 6′,2′′-terpyridine or 2,2′-bipyridine, in particular different from 4,4′,5,5′-tetramethyl 2,2′-bipyridine.
- What has been said above may in each case apply to substituted or unsubstituted ligands.
- what has been said above may apply to Cr or Ru complexes.
- ligands of this kind are not generally excluded from the invention; optionally, one, two or more, or all of the donor atoms may have the above-mentioned characteristic.
- At least one ligand may also be at least bi-dentate or tridentate, and at least one, two or more of the donor atoms of the ligands binding to a central atom can be different from nitrogen.
- At least one, two or more donor atoms of the at least one ligand, or 1, 2, 3 or 4 or more, or all of the donor atoms of the complex may, for example, be an sp 3 -configured nitrogen atom, such as the nitrogen atom of a substituted or unsubstituted alkylamine moiety which is not also encompassed by what has been said above.
- One, two or more, such as 3, 4 or all, of the ligand atoms binding to at least one central atom of the neutral metal complex may optionally be different from an aromatic nitrogen atom or different from nitrogen in general.
- one, two, three, four or more, or all of the donor atoms of at least one or all of the central atoms of the complex may be different from oxygen, without this being compulsory.
- At least one ligand atom binding to the central atom is selected from the group consisting of B, Al, Ga, In, C, Si, Ge, Sn, Pb, P, As, Sb, Bi, S, Se, Te and optionally also O, where 2, 3, 4 or more, or all of the ligand atoms binding to the central atom may be selected from that group.
- at least 1, 2, 3 or 4 or more, or all of the donor atoms are selected from the group consisting of B, C, Si, Ge, Sn, S, P, Se, As, Sb, Te (optionally including N), in particular selected from the group B, C, S, P, Se (optionally including N).
- at least one of the ligand atoms may in each case also be selected from the group Si, Ge, Sn, As, Sb, Te.
- At least 1, 2, 3 or 4 or more, in particular also all of the ligand atoms binding to the central atom may also have a lower electronegativity than nitrogen (electronegativity according to Allred-Rochow for N: 3.07).
- the above statements regarding the ligand atoms binding to the central atom apply to mononuclear metal complexes, but also to polynuclear metal complexes in which the ligand atom binding to the central atom may bind to only one central atom, but also to two or three central atoms, for example, in the case of a polynuclear complex.
- the ligand concerned may be a monodentate or also a bidentate, tridentate or polydentate ligand, where different ligand atoms may bind to different metal atoms of the metal complex of the invention and may, in the process, form bridging ligands, for example.
- metal-metal bonds can exist between two or more central atoms.
- these metal-metal bonds may formally correspond to a single bond but also optionally to a metal-metal multiple bond, though a metal-metal bond may also be present whenever the electron density between the metal atoms is lower than that for a metal-metal single bond.
- the other metal atoms of a polynuclear metal complex are not to be understood as ligand atoms for the purposes of the invention.
- At least 1, but optionally also 2, 3 or 4 or more, or all of the donor atoms of the metal complex may be components of a heterocyclic unsaturated ring, where the heteroatom is preferably the atom binding to the central atom of the metal complex.
- the heteroatom can in particular be an N, S, P or Se atom, but optionally also an O atom, though without being restricted to that.
- the heterocyclic unsaturated ring may optionally contain further heteroatoms, which may also be different from the first heteroatom.
- the metal complex can have 1, 2, 3, 4 or more, or all of the ligand atoms as components of such a heterocyclic unsaturated ring.
- the heterocyclic unsaturated ring may have 5, 6 or 7 ring atoms, though without being restricted to that.
- 1, 2, 3, 4 or more, or all of the donor atoms of the complex are components of an aromatic ring or a conjugated—e.g. mesomeric—system of the ligand, wherein the donor atom can bind, for example, to one or two multiply bonded atoms.
- At least one ligand of the neutral metal complex forms a ⁇ complex with the central atom.
- the ligand of the ⁇ complex can coordinate with a multiple bond, i.e. a double bond or triple bond, to the central atom, where the multiple bond may, for example, be a C—C, C—O, C—N, S—O, N—O, though without being restricted to that.
- the ligand forming the ⁇ complex may have a mesomeric or aromatic system which forms the ⁇ complex with the central metal atom.
- the ⁇ complex may, for example, contain a 2-electron donor such as a double or triple bond, a 3-electron donor such as an allyl group or an ⁇ 3 -1-3-cyclohexenyl group, a 4-electron donor such as a butadiene or cyclobutadiene group, a 5-electron donor such as an ⁇ 5 -1-5-cyclohexadienyl group or in particular a 6-electron donor group such as a benzene nucleus, a cyclopentadienyl anion, a cycloheptatrienyl cation, cycloheptatrienyl tri-anion, cyclo-octadienyl di-anion or the like.
- a 2-electron donor such as a double or triple bond
- a 3-electron donor such as an allyl group or an ⁇ 3 -1-3-cyclohexenyl group
- the complex may also have two or more ligands that form a ⁇ complex with the central atom.
- the complex may comprise two ligands forming a ⁇ complex with the central atom, which can coordinate the central atom, in particular in a linear manner.
- the ⁇ complex may also comprise further ligands, which do not coordinate with the central atom via a ⁇ electron system.
- Ligands of this kind may, for example, be carbonyl, phosphines or the like, without being restricted to these.
- the ⁇ complex may also have two or optionally more ligands coordinating with the central atom via a ⁇ bond system, these ligands being different from one another, in particular with regard to the number of electrons in the ⁇ electron system and/or with regard to the number of coordinating atoms, in particular the number of ring atoms in the case of aromatic ⁇ complexes.
- the central atom may, for example, be coordinated by a ⁇ benzene ligand and/or a ⁇ cyclopentadienyl ligand or by two ⁇ cyclopentadienyl ligands or two ⁇ benzene ligands, such as dibenzene iron, which are differently substituted, or by a cyclopentadienyl or benzo ligand on the one hand, and a ligand complexing via a double or triple bond on the other, where the double or triple bond may optionally also have a heteroatom.
- the biscyclopentadienyl complexes may be ⁇ 5 complexes, though without being restricted to that.
- one, more than one, or all of the ligands of the complex may be selected from the group comprising compounds I-10 (with compound 5 in particular as a singly or doubly charged anion or cation).
- one or more than one or possibly even all of the C, CR, CR 2 , C ⁇ , CR ⁇ , CR 2 ⁇ groups may be isoelectronically or non-isoelectronically substituted by appropriately identical or different heteroatoms.
- one or more than one of the groups CR or C ⁇ may be replaced by P.
- one or more than one of the groups CR 2 or CR ⁇ may be replaced by S.
- heteroatoms B, Al, Ga, In, N, P, As, Sb, Bi, Si, Ge, Sn, Pb, O, S, Se, Te, optionally also without O.
- the heteroatoms may be selected from the group B, Al, Ga.
- the heteroatoms may be selected in particular from the group N, P, As, Bi, preferably selected from the group N, P, As.
- the heteroatoms may be selected from the group Si, Ge, Sn, Pb, in particular from the group Si, Ge.
- the heteroatoms may be selected from the group O, S, Se, Te, in particular from the group O, S, Se.
- the heteroatoms from the groups mentioned may also in each case be atoms of the third main group period (atomic numbers in particular between 13 and 16) or the fourth main group period (atomic numbers in particular between 31 and 34).
- the groups R in the parent compounds I-10 may be the same or different, open-chain or components of a ring or ring system, and are preferably selected from: alkyl, including cycloalkyl, aryl, or the above heteroatoms.
- the alkyl or aryl groups may be completely or partially substituted with one or more heteroatoms from the above list, which may be the same or different.
- the above groups R but also quite generally groups in accordance with the invention, may be ones with a +I effect and/or +M effect on an unsaturated or aromatic ring (or P instead of N).
- the R groups in compounds according to the invention may also have unsaturated groups, e.g. with C ⁇ C, C ⁇ N bonds or the like.
- the central atom of the complexes may in each case be selected from the group Mn, Fe, Co, Ni, Cu, Zn or the group Cr, Mo, W, particularly preferably those selected from the group Fe, Co, Ni, such as complexes with Fe or Co.
- the central atom may also be a different metal atom from groups 6 or 7 to 10.
- 1, 2 or all of the ligands may in each case be cyclopentadienyl or benzene or may be selected from the group of compounds 3, 4 and 5 or from the group of compounds 6, 8 and 9, in particular also compound 8, or selected from the group of compounds 7, 10, where the ligands may in each case be substituted or unsubstituted.
- the metal complex of the invention is a polynuclear metal complex.
- the metal complex may be a polynuclear metal complex with at least one, two, three or four or optionally even more ligands which bind to at least two metal central atoms.
- the metal complex may in this case also have one, two or more metal-metal bonds, which may in each case be metal-metal single bonds or metal-metal multiple bonds.
- the polynuclear complex may have two, three or even four or more metal central atoms.
- the complex preferably does not contain more than 20 or not more than 10 metal atoms or not more than 6 or 4, in particular not more than 3 metal atoms.
- the metal complexes are in each case preferably isolated molecules.
- Polynuclear complexes may in particular be carbonyl or cyclopentadienyl complexes.
- the metal atoms of polynuclear metal complexes are preferably mainly or entirely transition metal atoms, in particular from the 6th or 7th to 10th groups, selected, for example, from the group Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, W.
- a metal complex of this kind may, for example, be a so-called paddlewheel complex 65, wherein two metal central atoms, in particular transition metal central atoms are bridged by 1, 2, 3, 4 or more bidentate ligands which in each case bind one ligand atom to both metal central atoms.
- the metal atoms in this case are usually coordinated 4-fold or optionally even 5-fold or higher.
- One or both metal central atoms M may optionally also be complexed, in each case independently of one another, with at least one further ligand, such as carbonyl, phosphine or others, which may in particular be disposed axially (terminally) to the M-M bond.
- at least one further ligand such as carbonyl, phosphine or others, which may in particular be disposed axially (terminally) to the M-M bond.
- the polynuclear metal complexes may have at least one atom from the group Mn, Fe, Co, Ni, Cu, Zn, in particular an atom from the group Fe, Co, Ni or at least one atom selected from the group Cr, Mo, W, in particular also Mo, W, where preferably all the central atoms of the neutral metal complex are identical.
- M can be any metal atom at all, in particular a transition metal atom, such as a transition metal atom from the first, second or third transition metal periods or an atom from the 6th or 7th to 10th transition metal groups.
- both metal atoms M can in each case be the same or different from one another.
- one or more of the bridge ligands can be replaced by monodentate ligands, such as by carbonyl, RCN, substituted or unsubstituted phosphines or others, where the substituent R can be any organic residue including hydrogen, in particular also a hydrocarbon residue or a substituted or unsubstituted alkyl residue, in particular a C1 to C10 alkyl residue, in particular C1 to C4 or to C6.
- At least one, more or all of the ligand atom(s) X binding to the metal atom may be selected from the group F, Cl, Br, I, O, S, Se, N, P, such as halogen, preferably selected from the group O, S, Se, N, P, particularly preferably selected from the group S, Se, N, P, where at least one, two, three or four or all of the ligand atoms can be different from N.
- X may, however, also be a different suitable atom.
- the various atoms X binding to the metal atom can be the same or different within a ligand or within the complex. This means that different ligands L, L′ may also be used as bidentate ligands bridging the two metal atoms.
- the atom Y is preferably an element from the main group, in particular a bi-, tri- or tetracovalent element from the main group.
- the atom Y is preferably selected from the group B, C, N, O Si, P, S, As, Se, Sb, Te, especially preferably selected from the group O, S, Se, N, P, C, in particular selected from the group S, Se, N, P (optionally also O), without being restricted to these.
- one or more of the ligands are selected from the group of halides, carboxylates, formamidinates, pyrimido-pyrimidines including their anions, in particular substituted or unsubstituted pyrimido[1,2-a]pyrimidine or their anions, in particular hpp (hpp: anion of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine), and guanidinates, optionally also diketonates.
- the ligands can in each case be the same or different from one another.
- At least one ligand is a carboxylate, a formamidinate, a pyrimido-pyrimidine, in particular hpp, or a guanidine.
- all the ligands of the complex are in each case a carboxylate, a formamidinate, a pyrimido-pyrimidine, in particular hpp, or a guanidine, all the ligands of the complex preferably being the same.
- the ligands are particularly preferably selected from the group of carboxylates, formamidinates, pyrimido-pyrimidines and guanidinates.
- the Y and also X groups can each be substituted or unsubstituted; they may, for example, have substituted or unsubstituted alkyl residues or hydrocarbon residues, for example in each case with C1 to C10 or higher, in particular C1 to C6 or C2 to C4, or other substituents.
- alkyl residue also comprises cycloalkyl residues, in particular cycloheptyl, cyclohexyl or cyclopentyl residues.
- the ligands which are used to produce structures 65a-65d are also in accordance with the invention.
- At least one, two or more, or all of the ligands are selected from the group of borates, carboranes, triazacycloalkanes, triazacycloalkenes, pyrroles, thiophenes, pyrazoles, imidazoles, thiazoles, oxazoles, pyridines, pyridazines, pyrimidines, pyrazines.
- at least one, two or more, or all of the ligands are selected from the group of borates, carboranes.
- At least one, more or all of the ligands may be selected from the group of triazacycloalkanes, triazacycloalkenes, optionally also other amines.
- At least one, two or more or all of the ligands may be selected from the group of pyrroles, thiophenes, pyrazoles, imidazoles, thiazoles and optionally oxazoles. At least one, two or more or all of the ligands may be selected from the group of pyrines, pyridazines, pyrimidines, pyradzines. The ligands may in each case be the same or different and may in each case be selected from one of the groups mentioned or from more than one of the groups mentioned.
- another ligand may be an arene or arenyl ⁇ -ligand, such as a substituted or unsubstituted cyclopentadienyl, benzene or cycloheptatrienyl ion, for example.
- the central atom of the respective complex may in each case be selected from the group Mn, Fe, Co, Ni, Cu, Zn or selected from the group Cr, Mo, W, particularly preferably selected from the group Fe, Co, Ni, such as complexes with Fe or Co.
- the central atom may also be a metal atom from groups 6 or 7 to 10.
- Preferred carboranes are those of the type [R 2 C 2 B 4 ] ⁇ , [R 2 C 2 B 9 H 9 ] 2 ⁇ , [R 2 C 2 B 10 H 10 ] 2 ⁇ , where R may be any substituents, in particular alkyl substituents, in particular lower alkyl substituents with C 1-6 .
- the substituents R may in each case be the same or different.
- the borate preferably possesses the general structure 15 (Table 2), where R is any substituent, preferably H, alkyl, in particular lower alkyl with C 1 -C 6 or aryl, in particular benzyl, or a hydrocarbon residue in general. It goes without saying that the substituent R may also possess heteroatoms, in particular N, O or halogen.
- R′ is any substituent, preferably alkyl, in particular lower alkyl with C 1 to C 6 or aryl, where R′ may possess heteroatoms such as, in particular, N, O, halogen. R′ may also be a pure hydrocarbon.
- R′′ the statements regarding R apply.
- the various substituents R, R′ or R′′ may in each case be the same or different.
- Two substituents R′′ may be part of a ring system, in particular part of an identical ring system, preferably part of a ring system fused to the skeleton, or parent structure.
- the ring system may be saturated, unsaturated, in particular aromatic.
- E is an at least divalent atom and may be selected from the group O, S, Se, Te, optionally selected from the group O, S, Se or selected from the group S, Se and Te.
- the group E of the various ring systems may in each case be the same or different.
- X is a “spacer”, where optionally 1, 2 or 3 of the X groups may be missing in the compound 15.
- X may be a branched or unbranched alkyl chain with or without heteroatom substituents, in particular an alkyl chain with 1 to 6, especially C 1 to C 4 or C 1 to C 2 , an aryl substituent, including a heterosubstituted aryl substituent, a fused aryl substituent with or without heteroatoms, an alkyl aryl substituent with or without a heteroatom or a heteroatom.
- the heteroatom is in each case preferably selected from the group N, P, S, Se, Ge, Sn, without being restricted thereto.
- the various groups X in the compound 15 may in each case be the same or different.
- X is preferably an alkyl chain, particularly preferably a lower alkyl chain with C1 to C6.
- Y is a heteroatom or carbon atom capable of acting as a donor, preferably selected from the group N, P, S, Se, Ge, Sn, optionally selected from the group N, P, S, Se or selected from the group P, S, Se, Ge, Sn.
- the various donor atoms Y may in each case be the same or different.
- Y may be part of a ring or a ring system, in particular an unsaturated ring or ring system, including an aromatic or heteroaromatic ring system.
- the ring possessing the hetero or carbon atom Y capable of acting as a donor preferably comprises 5 to 7 ring atoms, such as 5 or 6.
- the ring containing the donor atom Y may in each case have more heteroatoms, which can be the same or different, such as two or three.
- the heteroatoms may in each case be N atoms, for example, or possess at least one N atom.
- the borate may possess fewer than three, two or one, or no oxygen-donor atom.
- the borate may be one of the compounds 11, 12, 13, 14 or 16, wherein the metal complex may also possess different borate ligands, in particular different borate ligands from said group of compounds 11, 12, 13, 14 or 16.
- the Y atom may in each case also be a component of a pyrrole, indole, carbazole, furan, benzofuran, thiophene, benzothiophene, pyradzole, imidazole, thiazole, or oxazole ring.
- Y atoms can also be components of a pyridine, quinoline, isoquinoline, acridine, pyridazine, pyrimidine, pyrazine, quinoxaline, pteridine, or purine ring, wherein the donor atom Y binding to the central atom may be a component of a 5 or 6-membered ring.
- Y may be a component of a (hetero)aromatic ring. Said rings may in each case also be partially or fully saturated.
- Y may be a component of a 3 to 8-membered, especially 3, a 3 to 6-membered, in particular 5 or 6-membered ring.
- Y may, in particular as a ring, possess the heteroatoms O, N, P, S, Se, Ge, Sn, especially the heteroatoms O, N, P, S.
- C may form a carbanion in this context;
- C, Ge and Si may form carbenes (C(II)), germylenes (Ge(II)) and silylenes (Si(II)).
- the ring preferably has one or two multiple bonds which are in conjugation with the donor atom Y.
- residues Y in compound 15 may be the same or different.
- the borate may optionally also be only a bidentate or even only a monodentate ligand, in which one or two of the X-Y groups are replaced in each case by one substituent R, independently of one another, including H, where two substituents R may also form a saturated or unsaturated ring.
- the tridentate borate ligands may coordinate, especially facially, to the central atom.
- the B atom may optionally also be replaced by an Al or Ga atom.
- the central atom of the carborane or borate-metal complexes in particular the compounds 11, 12, 13, 14 or 16, can preferably be selected from the group Cr, Mn, Fe, Co, Ni, Cu, Zn, especially from the group Fe, Co, Ni; the metal atom can also be selected from the group Cr, Mo, W; it may be Cr, Mo or W, for example, or a metal from the transition metal groups 7 to 10.
- At least one, two or all of the ligands of the neutral metal complex may be a tripod ligand 18, which thus possess three ligand atoms,
- tripod ligands of this kind. It goes without saying, however, that the central B atom of compound 15, for example, can be replaced by a C, Si, P or As atom, though without being restricted to that.
- the tripod ligand according to formula 18 may possess a suitable central atom Z, which may be an element from the main group, but also a transition metal atom. Independently thereof, Z can be a metal atom, in particular also a metal atom from the main group. Z is an at least trivalent atom.
- Z is preferably carbon, but it may in particular also be B or P.
- the groups R, X and Y may also be formed in accordance with the compounds 11, 12, 13, 14 and/or 16.
- Y is generally also an atom capable of acting as a donor, which may be a heteroatom or a carbon atom. At least one, more or all of the heteroatoms of the tripod ligand are preferably selected from the group N, P, S, Se, Ge, Sn, optionally also Si, though without being restricted to that.
- the donor atom may in each case carry a charge, especially a negative charge; it may, for example, be a carbanionic carbon.
- the donor atom may also occur in a lower valency than its maximum valency; it may, for example, be a carbene-carbon atom, a germylene-germanium atom, a silylene-silicon atom, a Sn(II) or even a Pb(II) atom.
- at least one donor atom of the ligand is a carbanion-carbon atom or an atom with lower than its maximum valency, especially C, Ge, Si; this applies particularly preferably to all the donor atoms of the ligand.
- Y may optionally also be a component of a ring or ring system.
- the donor atoms of the tripod ligand are preferably the same as one another, but they may also be different from one another.
- the ligand preferably has at least one or two donor atoms as the carbanion-carbon atom binding to at least one metal central atom or, with regard to the ligand, a formally divalent atom selected from the group C (carbene), Si (silylene), Ge (germylene), optionally also Sn or Pb, which are in each case components of an aromatic or non-aromatic, preferably unsaturated ring, where the multiple bond may be in conjugation with the free electrons of the donor atom.
- the ring possessing the donor atom preferably has at least one or two further heteroatoms, preferably selected from the group N, P, As, S, Se or Te, especially N, S, Se, which may be the same or different in each case.
- One, two, more or all of the ligands of the metal complex of the invention may be triazacycloalkanes, especially those of the general formula 17, where m, n, O are integers, preferably integers from 0 to 6 independently of one another in each case, preferably from 0 to 4, particularly preferably 1 or 2 independently of one another in each case. m, n and o may be the same or different from one another in each case.
- Substituents R can be any residues, preferably alkyl residues, especially lower alkyl residues with C1 to C6, or aryl residues, including hydrogen. The alkyl or aryl residues may be substituted or unsubstituted. The residues may be the same or different in each case.
- the substituents R may be free electron pairs, as a result of which the ligand formally receives one or more negative charges.
- the residues R′ may be any substituents, preferably hydrogen, alkyl or aryl; as for the details in this context, the statements concerning the residue R apply mutatis mutandis.
- the various residues R′ may be the same or different. It goes without saying that one or more of the N atoms of the triazacycloalkanes may also be replaced by an atom selected from the group P, As, Sb. Triphosphacycloalkanes are preferred here.
- the above-mentioned groups between the heteroatoms of the cyclic ligands may also be unsaturated, for example forming triaza(hetero)cycloalkenes, dialkenes, trialkenes or the like.
- the alkyl or aryl residues of the substituents R and/or R′ may in each case also possess heteroatoms.
- complexes are preferred in which at least one, two or all of the ligands are Buckminster fullerenes, which bind to the central atom of the complex.
- the Buckminster fullerenes may in particular be C60 and/or C70 fullerenes. Derivatives of these fullerenes, especially substituted fullerenes, are thus also encompassed hereby.
- the fullerenes ultimately constitute substituted cyclopentadienyl ligands, since the latter complex the central metal atom via the cyclopentadienyl ring.
- pincer ligands which act as tridentate ligands vis-à-vis the central metal atom of the complex, are particularly preferred.
- pincer ligands may be bound meridionally to the central atom.
- the pincer ligands may in particular be 6-electron donors.
- the (formally uncomplexed) pincer ligands may be neutral or charged, preferably negatively charged.
- one, two or all of the pincer ligands of the complex possess the general structures 27, 27a, 28 or 28a in accordance with the formulae below; one, two or all of the pincer ligands of the complex, for example, possess one of the structures 27 or 28, or 27a or 28a. In particular, all the ligands of the complex may possess the structures 27 or 27a or 28 or 28a. It goes without saying that the pincer ligands of a complex may be the same or different.
- two further ligand atoms Y which are linked via bridge atoms or bridging atom groups X to the ring possessing the heteroatom Z.
- one or more of the groups X in the ligands according to the compounds 27, 27a, 28 or 28a may also be missing.
- the groups X and/or Y within the ligands 27, 27a, 28 or 28a may be the same or different in each case.
- the ring carrying the middle ligand atom of the pincer ligands may be a 5-membered or 6-membered ring, which may optionally possess one or more heteroatoms, one of which may be a donor atom.
- One or both of the X-Y groups in this case may likewise be rings or components of ring systems, especially components of 5 or 6-membered rings, which may in each case possess further heteroatoms in addition to the Y atom.
- the Y atom may in each case also be a carbon atom.
- At least one, two or three donor atoms Y, Y′ and Z of the pincer ligands or one, two or three or more of the donor atoms of the complex possessing at least two pincer ligands may be different from nitrogen.
- the pincer ligand may possess at least one or two or more rings containing one ligand atom in each case with a number of ring atoms different from 6, especially a 5-membered ring. That ring may be the ring containing the middle ligand atom Z, or it may form one of the X-Y groups. All the donor atoms may be components of a 5-membered ring, which can in each case be unsaturated or aromatic.
- One, two or more donor atoms of the ligands or all the donor atoms of the complex may in each case be components of an aromatic ring or a conjugated, unsaturated system. This applies in particular to donor atoms S, C(II) (carbene), C(carbanion), Si(II) and/or Ge(II).
- the donor atom may in particular also be adjacent to one or two heteroatoms with a free electron pair, such as N, P, As, Ab, S, Se, Te, which is preferably in conjugation with orbitals of the donor atom that are vacant or not maximally occupied. This may apply both to the pincer ligands and also to the monodentate or bidentate ligands mentioned below.
- Y is a heteroatom or carbon atom capable of acting as a donor, preferably selected from the group N, P, O, S, Se, Te, C, Si, Ge, Sn, Pb, e.g. selected from the group C, N, P, O, S, Se, though without being restricted to that.
- the Y atom may be different from N.
- the two Y atoms may be the same or different.
- Y may be part of a ring or ring system.
- Y may be a carbon atom, e.g. a carbanion or carbene carbon atom, or a Ge atom, in particular a germylene (Ge(II)), or Si atom, especially a silylene (Si(II)), or a sulphur atom.
- Z is a heteroatom or carbon atom capable of acting as a donor, preferably selected from the group C, N, P, O, S. If at least one of the Y atoms is an N atom, Z may be different from N.
- Z may be a carbon atom, e.g. a carbanion or carbene carbon atom, or Ge atom, in particular a germylene (Ge(II)), or a Si atom, especially a silylene (Si(II)), or a sulphur atom.
- X is a “spacer” and may be any at least divalent atom or a group of atoms.
- X can be a branched or unbranched alkyl chain, in particular a lower alkyl chain with C1 to C6, preferably C1 to C4 or one or two atoms, where X may possess no heteroatoms or one or more heteroatoms.
- the heteroatoms can be components of the bridge.
- X can be an aryl substituent, including a condensed aryl substituent with or without heteroatoms, including an alkyl-aryl substituent with or without a heteroatom.
- X may also be a single heteroatom, such as O, S, N, P or the like.
- R can be any substituent, preferably H, alkyl, in particular a lower alkyl with C1 to C6, or aryl.
- the alkyl or aryl residue can be substituted or unsubstituted and may optionally have one or more heteroatoms.
- the individual substituents R may be the same or different.
- Two substituents R may be part of a ring, which can be saturated, unsaturated, including aromatic, and may preferably be part of a ring system fused to the skeleton.
- the statements with regard to R apply to R′, R′ being in particular an atom other than hydrogen or a group of atoms.
- the substituents R′ may in each case be the same or different from one another.
- the donor atom E may in each case be an atom selected from the group C, Si, Ge, Sn, Pb, preferably selected from the group C, Si, Ge, in particular C or Ge, for example in oxidation state (II) in each case.
- the donor atom E may form a carbene, germylene or silylene ligand; preferably, two donor atoms E in each case form a bis-carbene, bis-germylene or bis-silylene ligand or mixed ligands with these donor atoms.
- the ring of the pincer ligand possessing an E atom preferably has, optionally apart from E, at least one or two further heteroatoms, which are preferably in each case components of a ring, preferably a unsaturated or aromatic ring.
- the further heteroatom(s) preferably bind(s) to the E atom, optionally via an unsaturated system such as a double bond.
- Heteroatoms may in particular be N or S.
- the ring possessing the donor atom E in particular as carbene C(II), Ge(II), Si(II)) may have two additional N atoms, two S atoms or one N and one S atom.
- the complex possessing at least one, more than one or exclusively pincer ligands preferably has at least one central atom selected from the group Cr, Mn, Fe, Co, Ni, Cu, Zn, preferably selected from the group Mn, Fe, Co, Ni, particularly preferably selected from the group Fe, Co, Ni, optionally including Mn.
- the at least one central atom can be selected from the group Cr, Mo, W, and may, for example, be Mo or W, optionally also Cr.
- the central atom may also generally be an atom from the 7th to 10th transition metal groups; in this context, it may be different from Cr or Ru, though this is not compulsory.
- compounds 20 to 26 and 29 to 37 may possess the central atoms mentioned above, which may optionally be different from Cr or Ru.
- the compounds 20 to 26 and 29 to 37 may, however, also possess a different central atom selected from the group of the first, the second or the third transition metal periods.
- the ligand may be selected from the group of compounds 20 to 24, where one or more of the atoms S or N of the terminal five-membered rings may also be replaced in each case by Se, Te or optionally 0, or P, As or Sb. One or more of the double bonds of the five-membered rings of the compounds 20 to 24 may optionally also be saturated.
- E can in each case be in particular carbene carbon C(II), Ge(II) (germylene) or Si(II) (silylene), optionally also O.
- the pincer ligand may further be selected from the group of compounds 25 or 26, where the S atom of the middle 5-membered ring or one or both of the S atoms of the terminal 5-membered rings of the compound 26 may be a Se or Te atom, optionally also O. One or more of the double bonds of the system may also be saturated. It may in each case in particular be carbene carbon C(II), Ge(II) or Si(II).
- the ligand may be selected from the group of compounds 29, 30, 31, where one or more of the S atoms may be replaced by Se or Te, optionally also 0, and one or more of the N atoms may be replaced by P, As or Sb.
- E can in particular be carbene carbon C(II), Ge(II) or Si(II) in each case.
- the pincer ligand can be selected from the group of compounds 32 to 34, where E may in particular be a divalent C (carbene), Si (silylene) or Ge (germylene) atom.
- E may in particular be a divalent C (carbene), Si (silylene) or Ge (germylene) atom.
- One or more of the N atoms may be replaced by P, As or Sb.
- One or more of the S atoms may be replaced by Se or Te, or optionally O.
- the pincer ligand may further be selected from the group of compounds 35, 36 or 37, where E is preferably a divalent carbon atom (carbene), Si(II) or Ge(II). At least one of the N atoms may be replaced by P, As or Sb. At least one of the S atoms may be replaced by Se or Te, or optionally O.
- E is preferably a divalent carbon atom (carbene), Si(II) or Ge(II).
- At least one of the N atoms may be replaced by P, As or Sb.
- At least one of the S atoms may be replaced by Se or Te, or optionally O.
- the ligand from the group of compounds 19 to 26 and 29 to 37 in particular the compounds 20 to 26 and 29 to 37, possesses a divalent ligand atom E selected from the group C, Si, Ge, Sn, Pb, in particular selected from the group C, Si, Ge, the central atom of the complex is preferably cobalt, in particular Co (II) or Ru, in particular Ru(0).
- the ligand may be a bidentate ligand of the general structure 45, 45a, 46, 46 a .
- the X-Y group may in particular form a heterocyclic ring with Y as the hetero donor atom, the ring preferably being a 5 or 6-membered ring.
- one, two or all of the ligands of the complex may be selected from the group of compounds 45, 45a, 46, 46a, such as a compound 45 or 45a or 46 or 46a, with the above statements regarding the pincer ligands applying to the groups Z, X, Y.
- one, two or all of the ligands of the complex may be selected from the group of compounds 38 to 44 and 47 to 56, in particular from the group of compounds 39 to 44 and 47 to 56, with the above statements regarding the pincer ligands applying mutatis mutandis to the groups R and E.
- the ligand may possess a ring with a divalent donor atom S, C, Si, Ge, Sn, Pb, in particular a donor atom C, Si, Ge, so that corresponding carbanions, carbenes, silylenes or germylenes are present.
- a ligand with one of the general structures 27, 27a, 28, 28a, 45, 45a, 46, 46a may possess a Z atom with C ⁇ (carbanion) or C(II) (carbene).
- one or both of the ligand atoms Y may then be an E atom selected from the group C, Si, Ge, Sn, Pb, in particular selected from the group C, Si, Ge, E being divalent (within the ligand).
- the donor atom Y of one of the compounds 27, 27a, 28, 28a, 45, 45a, 46, 46a may be the sulphur atom of a thiophene ring which may optionally also be replaced by Se or Te, optionally also by O.
- the ligand may be selected from the group of compounds 40, 41, 42, 43, where in each case N may also be replaced by P, As or Sb, and S may in each case be replaced by Se, Te, optionally also O.
- the ligand may be selected from the group of compounds 47, 48, 49, 50, 51, 52, in particular also from the group of compounds 49, 50, 51, 52, where in each case S may be replaced by Se or Te or optionally also O, and N may be replaced by P, As, Sb.
- the ligand may also be selected from the group of compounds 53, 54, 55 and 56, where S may be replaced by Se, Te or optionally O, and N may be replaced by P, As or Sb, E preferably being C(II) (carbene), Si(II) (silylene) or Ge(II) (germylene).
- the ligands may be selected from the group of compounds 57 to 64, in particular selected from the group of compounds 59 to 64, the statements regarding the pincer ligands applying mutatis mutandis to E and R, R′.
- the statements concerning Y or Z with regard to the pincer ligands apply to X as a carbon or hetero donor atom.
- the compound 58 may be an, optionally substituted, cyclopentadienyl anion, thiophene, pyrrole, selenophene, phosphene or furan.
- E is preferably a divalent atom from the group C (carbene), Si (silylene), Ge (germylene), Sn, Pb, preferably selected from the group C, Si, Ge. E can in particular also be C ⁇ (carbanion). Optionally, one or more double bonds of the compounds 57 to 64 may also be saturated.
- At least one, two or all of the rings are substituted with at least one substituent which exhibits a more powerful +I effect and/or a +M effect vis-à-vis hydrogen or a methyl group.
- at least one, two or all of the donor atoms has/have a +M substituent assigned to it/them which is in conjugation with it/them.
- one, two or more or all of the rings are substituted with at least one alkyl group or a group with the same or a more powerful +I effect. It goes without saying that at least one, more or all of the rings may also possess +M substituents, such as N-alkyl or N-dialkyl substituents (or P instead of N), what has been said above applying to alkyl.
- the metal complex of the invention preferably has an ionization potential in the gas phase of ⁇ 6.4 eV, preferably ⁇ 6 eV, especially ⁇ 5.5 eV.
- the ionization potential of the complex in the gas phase may be ⁇ 5.0 eV or ⁇ 4.5 eV.
- the redox potential of the n-dopants of the invention against ferrocene/ferrocenium can be ⁇ 0.09 V, preferably ⁇ 0.6 V, particularly preferably ⁇ 1.1 V, such as ⁇ 1.6 V or ⁇ 2.1 V, though without being restricted to that.
- the oxidation potential against ferrocene/ferrocenium can, for example, be determined cyclovoltammetrically.
- the potential in this case is largely independent of the electrolyte system used and can be determined in accordance with the IUPAC Recommendation (Gritzner, G.; Kuta, J. Pure Appl. Chem. 1984, 56, 461-466).
- the electrolyte system must have a sufficiently large electrochemical window and the donor compound must be sufficiently soluble.
- An example of a suitable electrolyte system is acetronitrile/1M LiClO 4 /Pt electrodes, though other suitable electrolyte systems can also be used.
- the vapor pressure of the complex used in accordance with the invention may in particular be ⁇ 10 ⁇ 3 Pa at 30° C., such as ⁇ 5 ⁇ 10 ⁇ 4 Pa or ⁇ 1 ⁇ 10 ⁇ 4 Pa.
- n-dopants of the invention used in each case and/or the complexes used in each case may be stable in air; optionally, the n-dopants and/or complexes of the invention used in each case may also be instable in air.
- the n-dopant metal complexes of the invention may be synthesized, for example, by synthesizing the compounds directly or by reducing salts, the resulting neutral metal complex then being present in the salt as a cation.
- the anion may be any suitable anion, such as a halogen, perchlorate, sulphate or the like.
- the reduction may be effected electrochemically or chemically for example, though without being restricted to that.
- the reduction may be effected, for example, by electrocrystallization, and the product obtained in this way, which can be harvested at the working electrode, can subsequently be purified.
- the complexes of the invention may in particular also be produced without using such an electrocrystallization step, however.
- the complexes of the invention can be synthesized using known processes; in some cases, they are also commercially available.
- the synthesis of the ligands of the complexes of the invention and of the complexes themselves is described in the following passages in the literature for example, each of which is hereby incorporated in the application in full by reference. It goes without saying that the cited passages from the literature are only mentioned by way of example, and that the ligands and complexes can in most cases also be synthesized by other suitable processes.
- the paddlewheel complexes can be isolated either by ligand substitution from other paddlewheel complexes (F. A. Cotton, J. G. Norman Jr., J. Coord. Chem. 1 (1970) 161-72; F. A. Cotton, D. J. Timmons, Polyhedron 17 (1998) 179-84), by salt metathesis from the metal halide and an anionic ligand (F. A. Cotton, D. J. Timmons, Polyhedron 17 (1998) 179-84), by reducing a cationic paddlewheel complex (F. A. Cotton, P. Huang, C. A. Murillo, X. Wang, Inorg. Chem. Commun. 6 (2003) 121-6), or in a redox reaction from a metal compound and the ligand (T. A. Stephenson, E. Bannister, G. Wilkinson, J. Chem. Soc. (1964) 2538-41).
- a new process has been developed, according to which the paddlewheel complexes of type 65a-d can be isolated efficiently in a single-stage synthesis process.
- a corresponding inorganic metal salt with free bases of the ligands shown in 65 a-d and a suitable strong reducing agent are heated to reflux in a suitable organic solvent, until the reaction has taken place completely.
- suitable solvents to be used are preferably those in which the complexes formed exhibit sufficient stability, though preferably dialkyl ether, cyclic ether, cyclic and open-chain polyether such as 1,4-dioxan, dimethoxyethane, etc., aromatic compounds and mixtures thereof.
- Suitable reducing agents are, for example, base metals, preferably alkali metals such as sodium, potassium and caesium. After separation of the inorganic by-products, the complexes are isolated by crystallization, precipitation or sublimation.
- the novel single-stage synthesis method opens up a time and resource-saving access to complexes of the type W 2 L 4 .
- the 2-amino-4,6-dimethyl-1,4,5,6-tetrahydropyrimidine was released in an alkaline ethanol solution.
- benzimidazo[1,2-a]pyrimidine hydroperchlorate 0.602 g benzimidazo[1,2-a]pyrimidine hydroperchlorate was heated for 9 h in a hydrochloric acid solution (2 M HCl) with palladium on activated charcoal, with H 2 fed in. Subsequent filtration, removal of the solvent and addition of diethyl ether yielded the 1,2,3,4-tetrahydro-benzimidazo[1,2-a]pyrimidine hydrochloride in the form of colorless crystals, which were recrystallized from ethanol.
- MCl 4 (WCl 4 , 1.00 g, 3.07 mmol), at least 2 equivalents of the respective ligands (9.21 mmol) and potassium in excess (approx. 1 g) are refluxed in 50 mL THF. It is then allowed to cool and the mother liquor is filtered off. The filtrate is concentrated until dry and extracted with toluene. The product is precipitated with hexane as a brown solid, isolated by filtration and dried in a high vacuum. Yields around 30%.
- this product is precipitated from the mother liquor with hexane.
- the solid isolated is not soluble in toluene.
- the thioketone process is based substantially on the principle which is also used for the silylenes and germylenes.
- thiophosgene instead of the GeCl 2 or SiCl 4 , thiophosgene is used, followed by reduction with potassium, sodium amalgam or KC 8 (N. Kuhn, T. Kratz, Synthesis (1993) 561; F. E. Hahn, L. Wittenbecher, R. Boese, D. Bläser, Chem. Eur. J. 5 (1999) 1931-5).
- the N-substituted imidazole parent substance is isolated first of all.
- the second nitrogen atom is then usually quaternized with an alkyl halide, and in the final step, the imidazolium salt is reacted to the carbene with a suitable base (KOBu t , Cs 2 CO 3 , BuLi etc) (see, for example: A. J. Arduengo III, R. L. Harlow, M. Kline, J. Am. Chem. Soc. 113 (1991) 361-3; M. R. Grimmet, Adv. Heterocyclic Chemistry 12 (1970) 105 and 134).
- the silver oxide process is a variant of the imidazole process.
- silver oxide is used as the base.
- a silver complex of the carbene forms. This can transfer the carbene to another metal (metal transfer) (Q.-X. Liu, F.-B. Xu, Q.-S. Li, X.-S. Zeng, X.-B. Leng, Y. L. Chou, Z.-Z. Zhang, Organometallics 22 (2003) 309-14; T. Ramnial, C. D. Abernethy, M. D. Spicer, I. D. McKenzie, I. D. Gay, J. A. C. Clyburne, Inorg. Chem. 42 (2003) 1391-3).
- N-heterocyclic silylenes are analogous to that of the corresponding germylenes.
- silicon(IV) chloride is used, which means that there must also be a subsequent reduction step (see, for example, M. Denk, R. Lennon, R. Hayshi, R. West, A. V. Belyakov, H. P. Verne, A. Haaland, M. Wagner, N. Metzler, J. Am. Chem. Soc. 116 (1994) 2691-2; B. Gehrhus, M. F. Lappert, J. Organomet. Chem. 617-8 (2001) 209-23).
- the heterocyclic germylenes (N, S) can usually be isolated by metallizing corresponding di-imines, diamines, aminothioles or dithioles and subsequently reacting them with germanium(II) chloride in accordance with known methods (J. Pfeiffer, M. Noltemeyer, A. Meller, Z. Anorg. Allg. Chem. 572 (1989) 145-50; A. Meller, C.-P. Gräbe, Chem. Ber. 118 (1985) 2020-9; J. Pfeiffer, W. Maringgele, M. Noltemeyer, A. Meller, Chem. Ber. 122 (1989) 245-52; O.de, P. Lönnecke, J. Heinicke, Polyhedron 20 (2001) 2215-22).
- Cycloheptatrienyl M. L. H. Green, D. P. K. Ng, Chem. Rev. 95 (1995) 439; M. Tamm, B. Dressel, R. Fröhlich, J. Org. Chem. 65 (2000) 6795; M. Tamm, T. Bannenberg, R. Dressel, R. Fröhlich, D. Kunz, Organometallics 20 (2001) 900; M. Tamm, T. Bannenberg, R. Fröhlich, S. Grimme, M. Gerenkamp, Dalton Trans. (2004) 482-91; M. Tamm, B. Dressel, T. Lügger, R. Fröhlich, S. Grimme, Eur. J. Inorg. Chem. (2003) 1088.
- Arene FeCp these are built up either from the ferrocene by arene substitution and subsequent reduction or by reacting Cp R Fe(CO) 2 Br with the arene and subsequent reduction: J.-R. Hamon, D. Astruc, P. Michaud, J. Am. Chem. Soc. 103 (1981) 758-66.
- Other arene transition-metal-metal Cp complexes can also be isolated accordingly, such as with the metal atoms Mn, Co, Ni, Cu, Zn or even Cr, Mo, W.
- borates in accordance with the compounds II to 14 and 16 can be produced by means of the following synthesis methods, for example, with other suitable synthesis methods also being possible in each case. It goes without saying that other tripod ligands can optionally also be obtained by means of similar synthesis methods:
- the synthesis is generally effected by reacting a ⁇ -diketone with hydrazine: M. B. Smith, J. March, March's Advanced Organic Chemistry, Wiley, New York, 5th edition, 1193
- synthesis can be effected by reacting the pyrazole with KBH 4 , as is described, for example, by S. Trofimenko, J. Am. Chem. Soc. 89 (1967) 3170
- the chelate ligand can be obtained in a multistage synthesis process by reacting boric acid trimethylester and a Grignard compound to isoboronic acid and subsequently reacting it with the pyrazole and pyrazolate: F. R. Bean, J. R. Johnson, J. Am. Chem. Soc. 54 (1932) 4415; E. Khotinsky, M. Melamed, Chem. Ber. 42 (1909) 3090; H. R. Snyder, J. A. Kuck, J. R. Johnson, J. Am. Chem. Soc. 60 (1938) 105; D. L. Reger, M. E. Tarquini, Inorg. Chem. 21 (1982) 840.
- Ligands and complexes based on 2-imidazolidine thione can be obtained according to J. K. Voo, C. D. Incarvito, G. P. A. Yap, A. L. Rheingold, C. G. Riordan, Polyhedron 23 (2004) 405-12; H. M. Alvarez, J. M. Tanski, D. Rabinovich, Polyhedron 23 (2004) 395-403; C. A. Dodds, M. Jagoda, J. Reglinski, M. D. Spicer, Polyhedron 23 (2004) 445-50.
- the substituents at the nitrogen atom can be isolated by alkylation or arylation from the trisammonium bromide of the parent substance. They are subsequently reacted with metal precursors. See, for example: R. Zhou, C. Wang, Y. Hu, T. C. Flood, Organometallics 16 (1997) 434; L. Wang, C. Wang, R. Bau, T. C. Flood, Organometallics 15 (1996) 491; L. Wang. J. R. Sowa Jr., C. Wang, R. S. Lu, P. G. Gasman, T. C. Flood, Organometallics 15 (1996) 4240; S. M. Yang, M. C. W. Chan, K. K. Cheung, C. M. Che, S. M.
- the tripod ligand class of compounds is also characterized by its wide variety. Some synthesis methods regarding compounds to be used in accordance with the invention have been described by:
- Carbene-based ligands in particular with a carbene donor atom: H. Nakai, Y. Tang, P. Gantzel, K. Meyer, Chem. Comm. (2003) 24-5; X. Hu, I. Castro-Rodriguez, K. Meyer, J. Am. Chem. Soc. 125 (2003) 12237-45; U. Kernbach, M. Ramm, P. Luger, W. P. Fehlhammer, Angew. Chem., Int. Ed. Engl. 35 (1996) 310-2;
- N donor atom T. Wilson, N. Braussaud, K. J. Cavell, Organometallics 20 (2001) 1247-50; L. Peters, N. Burzlaff, Polyhedron 23 (2004) 245-51; V. V. Karambelkar, R. C. diTargiani, C. D. Incarvito, L. N. Zakharov, A. L. Rheingold, C. L. Stem, D. P. Goldberg, Polyhedron 23 (2004) 471-80; D. L. Reger, J. R. Gardiner, M. D. Smith, Polyhedron 23 (2004) 291-9; M. Scarpellini, J. C. Toledo Jr., A. Neves, J. Ellena, E. E. Castellano, D. W. Franco, Inorg. Chim. Acta 357 (2004) 707-15;
- Phosphorus-based ligands in particular with a P donor atom: H. A. Mayer, W. C. Kaska, Chem. Rev. 94 (1994) 1239; B. C. Janssen, A. Asam, G. Huttner, V. Sernau, L. Zsolnai, Chem. Ber. 127 (1994) 501; H. Heidel, J. Scherer, A. Asam, G. Huttner, O. Walter, L. Zsolnai, Chem. Ber. 128 (1995) 293; S. Beyreuther, J. Hunger, G. Huttner, S. Mann, L. Zsolnai, Chem. Ber. 129 (1996) 745; J. C. Thomas, J. C. Peters, Polyhedron 23 (2004) 489-97.
- Sulphur-based ligands in particular with an S donor atom: H. M. Alvarez, J. M. Tanski, D. Rabinovich, Polyhedron 23 (2004) 395-403.
- metallotriphos ligands that can be used in accordance with the invention has been described by: O.de, S. Blaurock, J. Sieler E. Hey-Hawkins, Polyhedron 20 (2001) 2171-7; G. S. Ferguson, P. T. Wolczanski, L. Parkanyi, M. C. Zonneville, Organometallics 7 (1988) 1967; S. M. Baxter, G. S. Ferguson, P. T. Wolczanski, J. Am. Chem. Soc. 110 (1988) 4231.
- the metallated species can be reacted with a metal precursor. See, for example: L. A. Rivera-Rivera, G. Crespo-Roman, D. Acevedo-Acevedo, Y. Ocasio Delgado, J. E. Cortes-Figueroa, Inorg. Chim. Acta 357 (2004) 881-7.
- pincer ligands that can be used in metal complexes of the invention, see, for example: A. M. Magill, D. S. McGuinness, K. J. Cavell, G. J. P. Britovsek, V. C. Gibson, A. J. P. White, D. J. Williams, A. H. White, B. W. Skelton, J. Organomet. Chem. 617-8 (2001) 546-60.
- Carbene-based pincer ligands The ligand system can be synthesized by high-temperature synthesis from 2,6-dibromopyridine and N-substituted imidazole: R. S. Simons, P. Custer, C. A. Tessier, W. J. Youngs, Organometallics 22 (2003) 1979-82; J. A. Loch, M. Albrecht, E. Peris, J. Mata, J. W. Faller, R. H. Crabtree, Organometallics 21 (2002) 700; M. Poyatos, J. A. Mata, E. Falomir, R. H. Crabtree, E. Peris, Organometallics 22 (2003) 1110-4; A. A. D.
- Phosphorus-based pincer ligands in particular with a P donor atom, can be isolated from an alpha,alpha′-xylene- or lutidine dihalide by salt metathesis with a secondary phosphanide, for example according to W. V. Dahlhoff, S. M. Nelson, J. Chem. Soc (A) (1971) 2184; L. Barloy, S. Y. Ku, J. A. Osborn, A. DeCian, J. Fisher, Polyhedron 16 (1997) 291; B. D. Steffey, A. Miedamer, M. L. Maciejewski-Farmer, P. R. Bernatis, A. M. Herring, V. S. Allured, V.
- Biscarbenes with carbene donor atoms which can be used in accordance with the invention can be prepared according to M. Poyatos, M. Sanau, E. Peris, Inorg. Chem. 42 (2003) 2572-6. The synthesis follows the literature citations already described above.
- suitable n-dopants for organic semiconducting materials such as electron transport materials are described, e.g. those generally used in electronic devices, including optoelectronic devices, such as OLEDs, field effect transistors or organic solar cells.
- the semiconducting materials are preferably intrinsically electron-conductive.
- the matrix material may consist partially (>10 or >25% by weight) or substantially (>50% by weight or >75% by weight) or completely of a metal phthalocyanine complex, a Buckminster fullerene, optionally also a porphyrin complex, especially a metal porphyrin complex, an oligothiophene, oligophenyl, oligophenylene vinylene or oligofluorene compound, the oligomers preferably comprising 2-500 or more, preferably 2-100 or 2-50 or 2-10 monomeric units.
- the oligomer may also comprise >4, >6 or >10 or more monomeric units, especially also for the ranges specified above, i.e., for example, 4 or 6-10 monomeric units, 6 or 10-100 monomeric units or 10-500 monomeric units.
- the monomers or oligomers can be substituted or unsubstituted, and block or mixed polymers from the oligomers mentioned may also be present.
- the matrix can also be a mixture of oligomers with various chain lengths, as is the case for standard polymer layers.
- the matrix material may also be a compound with a triarylamine unit or spiro-bifluorene compound.
- the matrix materials mentioned may also be present in combination with one another, optionally also in combination with other matrix materials.
- the matrix materials may possess electron-pushing substituents such as alkyl or alkoxy residues which have reduced ionization energy or which reduce the ionization energy of the matrix material.
- the metal phthalocyanine complexes or porphyrin complexes used as the matrix material may have a metal atom from the main group or the B group.
- the phthalocyanine complex or porphyrin complex may in each case be partially hydrogenated, though the mesomeric ring system is preferably not disturbed in the process.
- VO vanadium oxide
- the same or other metal atoms, or oxo-metal atoms may be present in the case of porphyrin complexes.
- n-dopable matrix materials may also be used as n-dopable matrix materials: quinolinato complexes, such as those of aluminium or other metals from the main group, it also being possible for the quinolinato ligand to be substituted.
- the matrix material may be tris(8-hydroxy-quinolinato)-aluminium.
- Other aluminium complexes with 0 and/or N donor atoms can optionally also be used.
- the quinolinato complexes may, for example, contain one, two or three quinolinato ligands, the other ligands preferably complexing to the central atom with 0 and/or N-donor atoms, such as the above Al complex, for example.
- Phenanthrolines which may be substituted or unsubstituted, can also be used as matrix materials, in particular aryl-substituted, such as phenyl or naphthyl-substituted.
- Bphen can be used as the matrix material.
- Heteroaromatic compounds can also be used as matrix materials, such as in particular triazoles, optionally also pyrroles, imidazoles, triazoles, pyridines, pyrimidines, pyridazines and the like.
- the heteroaromatic compounds are preferably substituted, in particular aryl-substituted, such as phenyl or naphthyl-substituted.
- the triazole shown below can be used as the matrix material.
- the matrix material used preferably consists completely of a metal phthalocyanine complex, in particular ZnPc, a porphyrin complex, or a Buckminster fullerene, in particular fullerene C60.
- matrix materials mentioned can also be used mixed with each other or with other materials in the context of the invention. It goes without saying that other suitable organic matrix materials can also be used if they possess semiconducting properties.
- the invention further relates to an organic semiconducting material containing a metal complex of the invention as an n-dopant.
- the dopant is preferably present in a doping concentration of ⁇ 1:1 relative to the matrix molecule, or the monomeric unit of a polymeric matrix molecule, preferably in a doping concentration of 1:2 or less, particularly preferably 1:5 or less or 1:10 or less.
- the doping concentration may lie in the region of 1:1 to 1:100,000 or less, especially in the region of 1:5 to 10,000 or 1:10 to 1,000, such as in the region of 1:10 to 1:100 or 1:25 to 1:50, though without being restricted to that.
- the doping of the respective matrix material with the n-dopant to be used in accordance with the invention can be achieved by means of one or a combination of the following processes:
- the doping may optionally also take the form of evaporating the dopant out of a precursor compound, which is released when the dopant is heated and/or irradiated.
- a precursor compound it is possible in each case to use a carbonyl compound, dinitrogen compound or the like, which cleave off CO, nitrogen or the like when the dopant is released, though other suitable precursors can also be used, such as salts, e.g. halides or the like.
- Irradiation can be performed by means of electromagnetic radiation, especially visible light, UV light or IR light, such as laser light in each case, or also by other types of radiation.
- the irradiation is able to provide substantially all the heat needed for vaporization; it is also possible to irradiate in a targeted manner into specific bands of the compounds, precursors or compound complexes, such as charge-transfer complexes, in order, for example, by transferring them into excited states, to facilitate the vaporization of the compounds by dissociation of the complexes.
- the complex may, however, in particular also be sufficiently stable, to evaporate under the given conditions without dissociation or to be applied to the substrate. It goes without saying that other suitable processes for carrying out the doping can also be used.
- n-doped layers of organic semiconductors in accordance with the invention which are suitable for a wide variety of uses, can thus be prepared in this way.
- metal complexes used in accordance with the invention semiconducting layers can be produced which may optionally also be linear in shape, such as conductivity paths, contacts or the like.
- the metal complexes may in this case be used as n-dopants together with another compound, which can act as the matrix material, with the doping ratio being 1:1 or less.
- the metal complex used in accordance with the invention may be present to the other compound or component in each case, but also in higher proportions, so that the ratio of metal complex: compound may be in a ratio of >1:1, such as in a ratio of ⁇ 2:1, ⁇ 5:1, ⁇ 10:1 or ⁇ 20:1 or higher.
- the other component in each case may be one of the kind that can be used as the matrix material in the case of preparing doped layers, though without being restricted to this.
- the metal complex used in accordance with the invention may optionally also be present in substantially pure form, such as in the form of a pure layer.
- the region containing a metal complex of the invention or consisting substantially or completely of said metal complex may in particular be contacted in an electrically conductive manner with an organic semiconducting material and/or an inorganic semiconducting material; it may, for example, be arranged on a substrate of this kind.
- the metal complexes mentioned are preferably used as n-dopants, e.g. in a ratio of ⁇ 1:1 or ⁇ 1:2, or as explained earlier on.
- the metal complexes used as n-dopants in accordance with the invention it is possible, for example, when fullerene C 60 is used as the matrix, to obtain semiconducting layers with conductivities at room temperature in the region of 10 ⁇ 5 S/cm or higher, for example 10 ⁇ 3 S/cm or higher, e.g. 10 ⁇ 1 S/cm.
- phthalocyanine zinc was used as the matrix, a conductivity of higher than 10 ⁇ 8 S/cm was obtained, for example 10 ⁇ 6 S/cm. So far, it has not been possible to dope this matrix with organic donors, because the reduction potential of the matrix is too low.
- the conductivity of undoped phthalocyanine zinc is a maximum of 10 ⁇ 10 S/cm.
- the layer or the structure with a metal complex in accordance with the invention may in each case contain one or more different complexes of this kind.
- n-doped organic semiconducting materials which can be arranged in particular in the form of layers or electrical line paths
- electronic devices or devices containing them can be produced with an n-doped organic semiconductor layer, which are thus also encompassed by the invention.
- the term “electronic devices” also comprises opto-electronic devices.
- the electronic characteristics of an electronically functionally effective aspect of the device such as its electrical conductivity, light-emitting characteristics or the like, can be changed advantageously.
- the metal complexes of the invention as n-dopants for example, it is possible to improve the conductivity of the doped layers and/or the injection of the charge carriers of contacts into the doped layer.
- the invention encompasses in particular organic light-emitting diodes (OLED), organic solar cells, organic diodes, especially those with a high rectification ratio, such as 10 3 -10 7 , preferably 10 4 -10 7 or 10 5 -10 7 , and organic field effect transistors which are produced using the neutral metal complexes of the invention.
- OLED organic light-emitting diodes
- organic solar cells organic solar cells
- organic diodes especially those with a high rectification ratio, such as 10 3 -10 7 , preferably 10 4 -10 7 or 10 5 -10 7
- organic field effect transistors which are produced using the neutral metal complexes of the invention.
- an n-doped layer in accordance with the invention may be present in the following layer structures, for example, the base materials or matrix materials of the individual layers preferably being organic in each case:
- M-i-n metal-isolator-n-doped semiconductor, where the M layer forms the metal base contact and may, for example, be ITO, Au, Ag, Al etc.
- the top contact forms an ohmic contact with the n-doped layer and may consist, for example, of Al.
- the “i” layer stands for an undoped layer.
- n-i-M what has been said regarding the M-i-n structure applies; the difference with regard to the latter, however, is that the ohmic contact is provided on the substrate.
- p-i-n p-doped semiconductor-isolator-n-doped semiconductor
- n-i-p n-doped semiconductor-isolator-p-doped semiconductor
- i is once again an undoped layer
- p is a p-doped layer.
- the contact materials here are hole-injecting—in this case, a layer or contact of ITO or Au may be provided on the p-side for example —, or electron-injecting—in this case, a layer or contact of ITO, Al or Ag may be provided on the n-side.
- the i-layer may also be omitted if need be, as a result of which sequences of layers with p-n or n-p transitions can be obtained.
- the use of the dopant of the invention is not, however, limited to the above-mentioned embodiments; in particular, the layer structures can be supplemented or modified by introducing additional appropriate layers.
- OLEDs with sequences of layers of this kind can be built up in each case, in particular with a p-i-n structure or one inverse thereto, with n-dopants of the invention.
- electronic devices with p-n transitions can be produced, in which the same semiconducting material is used for the p as for the n-doped side in each case (homo-p-n transition) and in which a metal complex in accordance with the invention is used for the n-doped semiconducting material. Components of this kind are thus also encompassed by the invention.
- the metal complexes may be used in accordance with the invention in the electronic devices, but also in layers, conductivity paths, point contacts or the like if the latter predominate over other components, for example as an injection layer in a pure or substantially pure form.
- metal complex in accordance with the invention is provided, wherein the metal complex may in each case be, for example:
- M-to-(terpyridine) with M equals Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, or W
- M 2 hpp 4 with M equals Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, or W
- the central atom can also in particular be Cr, Mn, Co, Ni, Cu or Zn or Mo or W in each case.
- the compounds 21, 22, 23, 24 in particular can be used, where R is hydrogen or methyl.
- E can in this case be —C— or —Ge— in particular, as a result of which the corresponding biscarbene ligands or bisgermylene ligands are present. It goes without saying that optionally one or more of the hydrogen atoms of the ligands may be replaced by other residues, including alkyl residues.
- a metal complex according to one of the compounds II to 14, 16 is prepared, where R and R′′ are methyl in each case and E is S in each case.
- the central atom is Fe.
- the central atom in each case is Cr, Mn, Co, Ni, Cu, Zn or Mo or W.
- the metal complex is vaporized simultaneously with the matrix material.
- the matrix material in each case is phthalocyanine zinc or fullerene C 60 .
- the N-dopant and matrix material can be vaporized in such a way that the layer deposited on a substrate in a vacuum evaporation unit has a doping ratio of n-dopant to matrix material of 1:10.
- the layer of the organic semiconducting material doped in each case with the n-dopants of the invention is applied to an ITO layer (indium tin oxide), which is arranged on a glass substrate.
- ITO layer indium tin oxide
- a metal cathode is applied, for example by vapor-deposition of a suitable metal, in order to produce an organic light-emitting diode.
- the organic light-emitting diode can also have a so-called inverted layer structure, the sequence of layers being: glass substrate—metal cathode-n-doped organic layer—transparent conductive top layer (for example ITO). It goes without saying that, depending on the particular application, further layers may be provided between the individual layers mentioned.
- the neutral cobalt complex cobalt-bis(phenylene-1-yl-2,6 dipyridyl) (ligand: compound 29) was prepared using a conventional process.
- a layer of zinc phthalocyanine (ZnPc) was doped with the metal complex [CR2(hpp) 4 ].
- the doped layer was produced by mixed evaporation of the ZnPc matrix and the dopant CR2(hpp) 4 in a high vacuum.
- the concentration of the dopant in the matrix was 1.9 mol %.
- the sublimation temperature of the dopant was 160° C.
- the doped layer exhibited a high conductivity of 4 ⁇ 10 ⁇ 6 S/cm. By curing the layer at 70° C., it was possible to increase the conductivity to 6 ⁇ 10 ⁇ 5 S/cm.
- the activation energy of the conductivity was 0.27 eV.
- a layer of fullerene C60 was doped with the metal complex cobaltocene.
- a pure layer of the fullerene was produced by sublimation in a high vacuum. That layer had a low conductivity of 1 ⁇ 10 ⁇ 7 S/cm.
- the doped layer was then placed in a container in which there was a vaporizer filled with cobaltocene. The container was filled with nitrogen. The cobaltocene was sublimed thermally in that container.
- the cobaltocene deposited on the surface of the fullerene layer led to the formation there of a thin highly doped layer.
- the cross-current measured in the layer increased by 3 orders of magnitude in the process.
- the conductivity of the highly doped layer was therefore at least 1 ⁇ 10 ⁇ 4 S/cm.
- the fullerene layer doped in this way was then transferred back to the vacuum chamber. There, high conductivities of at least 2 ⁇ 10 ⁇ 5 S/cm continued to be measured. In this way, it was proven that the increase in conductivity observed was indeed due to the doping of the fullerene, since any layers of pure, neutral cobaltocene that might be formed are not stable, because of their vapor pressure in the high vacuum.
Abstract
Description
- the structural elements a-e may mean: a=—CR1R2—, b=—CR3R4—, c=—CR5R6—, d=—CR7R8— and e=—CR9R10—, where R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are, at the same time or independently of one another, H, C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR; preferably, R1, R3, R5, R7, R9=H and R2, R4, R6, R8, R10=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR, or
- optionally, a or b or e or d may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, or
- optionally, a and d or b and e may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, or
- at c, C is replaced by Si,
- wherein the bonds b-d and c-e or b-d and a-c can, at the same time or independently of one another, be unsaturated,
- wherein the bonds b-d, a-c and c-e can, at the same time or independently of one another, be part of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- wherein the bonds b-d, a-c and c-e can, at the same time or independently of one another be part of an aromatic or condensed aromatic ring system which may also contain the heteroelements O, S, Se, N,
- wherein the atom E is an element from the main group, preferably selected from the group N, P, As, Sb, though without being limited to these,
- wherein the structural element a-E-b may optionally be a component of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the structural element a-E-b may optionally be a component of an aromatic ring system which may also contain the heteroelements O, S, Se, N,
wherein the metal M is a transition metal, preferably W or Mo;
- the structural elements a-f may mean: a=—CR1R2—, b=—CR3R4—, c=—CR5R6—, d=—CR7R8—, e=—CR9R10— and f=CR11R12, where R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12 are hydrogen, C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR; preferably R1, R3, R5, R7, R9, R11=H and R2, R4, R6, R8, R10, R12=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR, the structure 65b with R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12=H being excluded from this, or
- in the structural elements c and/or d, C may be replaced by Si, or
- optionally, a or b or e or f may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, or
- optionally, a and f or b and e may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl,
- wherein the bonds a-c, b-d, c-e and d-f, but not simultaneously a-c and c-e and not simultaneously b-d and d-f may be unsaturated,
- wherein the bonds a-c, b-d, c-e and d-f can be part of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the bonds a-c, b-d, c-e and d-f may be part of an aromatic or condensed aromatic ring system which may also contain the heteroelements O, S, Se, N,
- wherein the atom E is an element from the main group, preferably selected from the group N, P, As, Sb, though without being limited to these,
- wherein the structural element a-E-b may optionally be a component of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the structural element a-E-b may optionally be a component of an aromatic ring system which may also contain the heteroelements O, S, Se, N,
wherein the metal M is a transition metal, preferably W or Mo;
- the structural elements a-f may mean: a=—CR1R2—, b=—CR3R4—, c=—CR5R6—, d=—CR7R8—, e=—CR9R10— and f=CR11R12, where R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12 can, at the same time or independently from one another, be H, C—C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR; preferably R1, R3, R5, R7, R9, R11=H and R2, R4, R6, R8, R10, R12=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR, or
- at c or e, C may be replaced by Si, or
- optionally, a or b or d or f may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, or
- optionally, a and d or b and f may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl,
- wherein the bonds a-c, c-e, e-f and b-d, but not simultaneously a-c, c-e and e-f and not simultaneously a-c and c-e and not simultaneously c-e and e-f may be unsaturated,
- wherein the bonds a-c, c-e, e-f and b-d can be part of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the bonds a-c, c-e, e-f and b-d may be part of an aromatic or condensed aromatic ring system which may also contain the heteroelements O, S, Se, N,
- wherein the atom E is an element from the main group, preferably selected from the group N, P, As, Sb, though without being limited to these,
- wherein the structural element a-E-b may optionally be a component of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the structural element a-E-b may optionally be a component of an aromatic ring system which may also contain the heteroelements O, S, Se, N,
wherein the metal M is a transition metal, preferably W or Mo;
- wherein the structural elements a-g may mean: a=—CR1R2—, b=—CR3R4—, c=—CR5R6—, d=—CR7R8—, e=—CR9R10—, f=CR11R12 and g=CR13R14, where R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14 can, at the same time or independently from one another, be H, C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR; preferably, R1, R3, R5, R7, R9, R1, R13=H and R2, R4, R6, R8, R10, R12, R14=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, —NR2 or —OR, or
- at c, d and f, though not d and f simultaneously, C may be replaced by Si, or
- optionally, a or b or e or g may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl, or
- optionally, a and g or b and e may be NR with R=C1-C20 alkyl, C1-C20 cycloalkyl, C1-C20 alkenyl, C1-C20 alkinyl, aryl, heteroaryl,
- wherein the bonds a-c, c-e, b-d, d-f and f-g, but not simultaneously a-c and c-e, and not simultaneously b-d, d-f and f-g, and not simultaneously b-d and d-f, and not simultaneously d-f and f-g, may be unsaturated,
- wherein the bonds a-c, c-e, b-d, d-f and f-g can be part of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the bonds a-c, c-e, b-d, d-f and f-g may be part of an aromatic or condensed aromatic ring system which may also contain the heteroelements O, S, Se, N,
- wherein the atom E is an element from the main group, preferably selected from the group N, P, As, Sb, though without being limited to these,
- wherein the structural element a-E-b may optionally be a component of a saturated or unsaturated ring system which may also contain the heteroelements O, S, Se, N, P, Si, Ge, Sn, or
- the structural element a-E-b may optionally be a component of an aromatic ring system which may also contain the heteroelements O, S, Se, N
- wherein the metal M is a transition metal, preferably W or Mo.
which bind to at least one central metal atom of the complex concerned and bind to a central atom via further atoms or groups, which have the function of spacers. Compounds according to formula 15 are tripod ligands of this kind. It goes without saying, however, that the central B atom of compound 15, for example, can be replaced by a C, Si, P or As atom, though without being restricted to that. In general, the tripod ligand according to formula 18 may possess a suitable central atom Z, which may be an element from the main group, but also a transition metal atom. Independently thereof, Z can be a metal atom, in particular also a metal atom from the main group. Z is an at least trivalent atom. Z is preferably carbon, but it may in particular also be B or P. As to the rest, what has been stated above with regard to the borates applies to the groups R, X and Y. In particular, the groups -X-Y may also be formed in accordance with the compounds 11, 12, 13, 14 and/or 16.
-
- (a) Mixed vaporization in a vacuum with one source for the matrix material and one for the dopant.
- (b) Sequential deposition of the matrix material and the n-dopant on a substrate, subsequently diffusing the dopant in, in particular by means of thermal treatment
- (c) Doping a matrix layer using a solution of n-dopant, followed by evaporating the solvent, in particular by means of thermal treatment
- (d) Surface-doping a layer of matrix material by means of a layer of dopant applied to the surface
- (e) Preparing a solution of matrix molecules and dopant and then preparing a layer of this solution by conventional methods, such as evaporating the solvent or hydroextracting
Claims (51)
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DE102004010954.0 | 2004-03-03 | ||
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PCT/DE2005/000372 WO2005086251A2 (en) | 2004-03-03 | 2005-03-03 | Use of metal complexes as n-dopants for organic semiconductors and production thereof including their ligands |
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KR100867028B1 (en) | 2008-11-04 |
WO2005086251A3 (en) | 2006-02-16 |
CN1914747B (en) | 2014-12-10 |
HK1100266A1 (en) | 2007-09-14 |
IN2006MU00293A (en) | 2007-06-22 |
DE502005010680D1 (en) | 2011-01-27 |
EP1672714A3 (en) | 2006-10-18 |
EP1768200A1 (en) | 2007-03-28 |
EP1721347A2 (en) | 2006-11-15 |
DE102004010954A1 (en) | 2005-10-06 |
EP1768200B1 (en) | 2008-05-07 |
CN1914747A (en) | 2007-02-14 |
EP1672714A2 (en) | 2006-06-21 |
JP4847947B2 (en) | 2011-12-28 |
KR20060110269A (en) | 2006-10-24 |
CN101580519A (en) | 2009-11-18 |
US20090212280A1 (en) | 2009-08-27 |
JP2007526640A (en) | 2007-09-13 |
WO2005086251A2 (en) | 2005-09-15 |
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